/**
 * Copyright 2011-2019 Asakusa Framework Team.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.asakusafw.lang.compiler.cli;

/**
 * Represents a value or values container.
 * @param <T> the value type
 */
public interface Holder<T> extends Iterable<T> {

    /**
     * Returns whether this holder is empty or not.
     * @return {@code true} if this holder is empty, otherwise {@code false}
     */
    boolean isEmpty();
}
